Perhaps you should try some spelling variations:
thien quan » trien quang, lien quan, thien van
hieu quan » hieu qua, lieu quan, lien quan
thang cam » thanh cham, hang ca, hang cau
thang tam » thanh tam, trung tam, hang tai
nang cong » nang song, dang cong, bang cong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu quan) or (thien quan)) - hanh ((thang cam) OR (thang tam)) nang cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu quan) OR (thien quan)) - hanh ((thang cam) OR (thang tam)) nang cong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu quan) or (thien quan)) - hanh ((thang cam) OR (thang tam)) nang cong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu quan) or (thien quan)) - hanh ((thang cam) OR (thang tam)) nang cong dan toan cau*.